So I've been in the process of replacing my timing chains on my 1997 F150 4.6, and I waited to remove the chains off completely because I didn't have the camshaft holding tool, and didn't want the camshafts to snap back. So I decided to be a cheap skate and use a special pair of vise grips I found in the shop today, that look to be for this purpose. I marked the chain links above all the timing marks and then removed the tensioner on the left side if you're standing in front of the truck. It was at TDC when I did this. However I took the vise grips off the camshaft and it moved back to a natural position. I struggled to get it back in the area it's suppose to be. Is it worth continuing on, or have I possibly destroyed valves? I didn't hear anything but it has a lot of tension when you try to move it by hand. So is it ok that it moved like that?

 

You should be ok, just line all your marks back up and put it together.

 

I am sort of confused. Did you do a compression test before you pulled the front cover off your motor? If no, then what led you to the TC and chains? What is going to be the result if you put it back together and still have your misfire?

If you still have everything hooked together, I'd certainly do a quick compression test before I replaced a load of parts, only to find I have a bad vavle or seat or even head. That's just me. I hate doing a job twice. Hope this works out for you.

 

Because the noise is coming from the area of the timing chain. I tested that theory with a stethoscope. None the less, once the cover came off there was way too much slack in the passenger side chain. If it still misfires, I'll continue to drive it until I absolutely have to put a new motor in.

 

You confirmed what I was thinking. TY.

 

I mean you're exactly right by what your saying, no doubt. I have heard you are one of the better sources on here for info. But after all the testing I've done if this doesn't correct anything, it's more than likely safe to assume the engine has internal damage. Only reason I jumped on this one is because like I said about the noise and verifying where. I'd be pretty convinced if the valve timing is off because of slack that could definitely cause a misfire and major damage. Could very well be as to why my CEL flashes as it does.